Add retry guidance and screenshot to Copilot Space skill steps

[Copilot]

The skill steps did not explain what to do when Copilot Space failed to create the requested issue or pull request. This updates the learner-facing step content to add a left-aligned retry note and references the provided retry-button screenshot from the local .github/images directory.

• Step content

  • Adds a retry note to the issue-creation step in .github/steps/1-step.md
  • Adds the same guidance to the pull-request creation steps in .github/steps/2-step.md and .github/steps/3-step.md
  • Keeps the note flush to the left margin so it renders consistently with the surrounding instructions

• Image asset

  • Adds /.github/images/retry-copilot-space.png
  • References the image using the existing relative image pattern already used by other step documents

• Content polish

  • Uses step-appropriate wording (issue in step 1, issue or pull request in later steps)
  • Improves image alt text for accessibility

> [!NOTE]
> If an issue or pull request is not created, click the **Retry** button shown below

<img width="215" alt="Retry button to regenerate an issue or pull request in Copilot Space" src="../images/retry-copilot-space.png" />

[Copilot]

Pull request overview

This PR improves the learner-facing GitHub Skills step instructions by adding explicit guidance for what to do when Copilot Spaces fails to create the requested issue or pull request, including a referenced screenshot of the Retry button.

Changes:

• Adds a left-aligned [!NOTE] callout instructing learners to use Retry if creation fails (issue in Step 1; issue/PR in Steps 2–3).
• References ../images/retry-copilot-space.png with improved alt text to support accessibility.
• Applies the same retry guidance consistently across Steps 1–3.

Show a summary per file

File	Description
.github/steps/1-step.md	Adds a retry note and screenshot reference for failed issue creation.
.github/steps/2-step.md	Adds retry guidance and screenshot reference during pull request creation.
.github/steps/3-step.md	Adds retry guidance and screenshot reference during pull request creation.

Copilot's findings

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• Files reviewed: 3/4 changed files
• Comments generated: 0